3261565121 has 2 divisors, whose sum is σ = 3261565122. Its totient is φ = 3261565120.

The previous prime is 3261565091. The next prime is 3261565169. The reversal of 3261565121 is 1215651623.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3216137521 + 45427600 = 56711^2 + 6740^2 .

It is a cyclic number.

It is not a de Polignac number, because 3261565121 - 2⁶ = 3261565057 is a prime.

It is not a weakly prime, because it can be changed into another prime (3261565171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1630782560 + 1630782561.

It is an arithmetic number, because the mean of its divisors is an integer number (1630782561).

Almost surely, 2^3261565121 is an apocalyptic number.

It is an amenable number.

3261565121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3261565121 is an equidigital number, since it uses as much as digits as its factorization.

3261565121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The square root of 3261565121 is about 57110.1139991858. The cubic root of 3261565121 is about 1483.0029606479.

The spelling of 3261565121 in words is "three billion, two hundred sixty-one million, five hundred sixty-five thousand, one hundred twenty-one".